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. 1988 Feb;170(2):967–971. doi: 10.1128/jb.170.2.967-971.1988

Differential regulation of enzyme activities involved in aldehyde metabolism in the luminescent bacterium Vibrio harveyi.

D M Byers 1, A Bognar 1, E A Meighen 1
PMCID: PMC210749  PMID: 2828339

Abstract

The effects of catabolite repression and nutrient abundance on the activities of Vibrio harveyi enzymes known to be related to aldehyde metabolism were investigated. The growth of cells in complex medium containing glucose, which decreases in vivo luminescence and luciferase synthesis, also resulted in decreases in the specific activities of V. harveyi aldehyde dehydrogenase and acyl carrier protein acyltransferase as well as in the degree of fatty acylation of three bioluminescence-specific polypeptides (32, 42, and 57 kilodaltons), as monitored by sodium dodecyl sulfatepolyacrylamide gel electrophoresis. This repression was partially alleviated in glucose medium containing cyclic AMP. The acylation of the above-mentioned proteins, in addition to light emission and luciferase and acyltransferase activities, was also repressed when cells were grown in minimal medium, with partial recovery of these functions upon the addition of arginine. In contrast, aldehyde dehydrogenase activity was increased in minimal medium. These results suggest that the 42-, 57-, and 32-kilodalton proteins, which are responsible for the supply and reduction of fatty acids to form aldehydes for the luciferase reaction, are regulated in the same way as luciferase under the above-described conditions. However, aldehyde dehydrogenase, whose role in V. harveyi aldehyde metabolism is not yet known, is regulated in a different way with respect to nutrient composition.

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Selected References

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